| | Module | State | Calculating coordinates | Measuring coordinates | Error (mm) | | | |
| | Head circumference positioning block 1 | High position and extension | (-64.7, 173.8, 360.0) | (-63.5, 174.5, 357.0) | 1.2 | 0.7 | -3.0 | | High position and shorten | (-82.0, 183.8, 360.0) | (-84.0, 182.0, 358.0) | -2.0 | -1.8 | -2 | | Low position and extension | (-64.7, 173.8, 260.0) | (-64.0, 173.5, 258.5) | 0.7 | -0.3 | -1.5 | | Low position and shorten | (-82.0, 183.8, 260.0) | (-81.0, 183.0, 261.0) | 1.0 | -0.8 | 1.0 |
| | Head circumference positioning block 2 | High position and extension | (64.7, 173.8, 360.0) | (65.0, 171.0, 358.0) | 0.3 | -2.8 | -2.0 | | High position and shorten | (82.0, 183.8, 360.0) | (83.5, 183.0, 358.0) | 1.5 | -0.8 | -2.0 | | Low position and extension | (64.7, 173.8, 260.0) | (65.5, 174.5, 260.0) | 0.8 | 0.7 | 0 | | Low position and shorten | (82.0, 183.8, 260.0) | (80.0, 182.5, 259.0) | -2.0 | -1.3 | -1.0 |
| | Fixed head circumference positioning block 3 | High position | (0, 34.5, 360.0) | (0, 35.0, 358.5) | 0 | 0.5 | -1.5 | | Low position | (0, 34.5, 260.0) | (0, 33.5, 261.0) | 0 | -1.0 | 1.0 |
| | Head top positioning block | High position and extension | (0, 135.0, 430.0) | (1.0, 133.5, 428.5) | 1.0 | -1.5 | -1.5 | | High position and shorten | (0, 135.0, 450.0) | (0.5, 133.5, 449.0) | 0.5 | -1.5 | -1.0 | | Low position and extension | (0, 135.0, 330.0) | (0, 134.0, 328.0) | 0 | -1.0 | -2.0 | | Low position and shorten | (0, 135.0, 350.0) | (-0.5, 133.5, 348.5) | -0.5 | -1.5 | -1.5 |
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